<HTML>
<HEAD>
<TITLE>JavaScript Source Code 3000:  Messages:  Elastic Bullets</TITLE>
<META HTTP-EQUIV="JavaScript Source Code 3000" CONTENT = "no-cache">
<META NAME="date" CONTENT="2000-09-09">
<META NAME="channel" CONTENT="Web Developer">
<META NAME="author" CONTENT="Philip Winston (pwinston@yahoo.com)">
<META NAME="section" CONTENT="Messages">
<META NAME="description" CONTENT="Moves a series of images around the screen as if they were connected to the mouse cursor on a piece of elastic.  In the demo, a series of small circular bullet icons are used.  You could easily use any small images you want.  You have to see it to believe it, wow!">
</HEAD>

<BODY BGCOLOR=#ffffff vlink=#0000ff>

<BR>
<center>
<table width=600 cellpadding=0 cellspacing=10>
<tr>
<td width=468 align=center>

    
    
</td>
<td width=120 align=center>
    
</td>
</tr>
</table>
<BR>
<BR>
<basefont size=3>
<FONT SIZE="+2" FACE="Helvetica,Arial">
<A HREF="../index.htm" /" TARGET="_top"><FONT COLOR="#0000FF"><b>Home</b></font></A>
<img src="../img/arrow.gif" /img/arrow.gif" height=13 width=7 border=0 alt="}">
<A HREF="index.htm" /messages/"><font color="#FF0000"><b>Messages</b></font></A>
<img src="../img/arrow.gif" /img/arrow.gif" height=13 width=7 border=0 alt="}">
<FONT COLOR="#006666"><b>Elastic Bullets</b></font></font>
<BR>
<BR>
<table BORDER=0 WIDTH=486 CELLPADDING=3 CELLSPACING=0>
<tr><td><font FACE="helvetica,arial,geneva">
<br>
<br>
<!-- Description --><!--content_start-->
Moves a series of images around the screen as if they were connected to the mouse cursor on a piece of elastic.  In the demo, a series of small circular bullet icons are used.  You could easily use any small images you want.  You have to see it to believe it, wow!
<hr>
</td></tr>
</table>
<!-- Demonstration -->
<div id="dot0" style="position: absolute; visibility: hidden; height: 11; width: 11;"><img src="../img/elastic-bullets/bullet.gif" /img/elastic-bullets/bullet.gif" height=11 width=11></div>
<div id="dot1" style="position: absolute; height: 11; width: 11;"><img src="../img/elastic-bullets/bullet.gif" /img/elastic-bullets/bullet.gif" height=11 width=11></div>
<div id="dot2" style="position: absolute; height: 11; width: 11;"><img src="../img/elastic-bullets/bullet.gif" /img/elastic-bullets/bullet.gif" height=11 width=11></div>
<div id="dot3" style="position: absolute; height: 11; width: 11;"><img src="../img/elastic-bullets/bullet.gif" /img/elastic-bullets/bullet.gif" height=11 width=11></div>
<div id="dot4" style="position: absolute; height: 11; width: 11;"><img src="../img/elastic-bullets/bullet.gif" /img/elastic-bullets/bullet.gif" height=11 width=11></div>
<div id="dot5" style="position: absolute; height: 11; width: 11;"><img src="../img/elastic-bullets/bullet.gif" /img/elastic-bullets/bullet.gif" height=11 width=11></div>
<div id="dot6" style="position: absolute; height: 11; width: 11;"><img src="../img/elastic-bullets/bullet.gif" /img/elastic-bullets/bullet.gif" height=11 width=11></div>

<br><br>
You need to save our bullet image<br>
or find another one for this script.<br>
Right-click the images below and<br>
select "Save Image As..."<br><br>
<img src="../img/elastic-bullets/bullet.gif" /img/elastic-bullets/bullet.gif" width=11 height=11 border=1><br><br>
<P>
<P>

<SCRIPT LANGUAGE="JavaScript">
<!-- Original:  Philip Winston (pwinston@yahoo.com) -->
<!-- Web Site:  http://members.xoom.com/ebullets -->
<!-- 'Scrolling Fix' by Troels Jakobsen <tjak@get2net.dk> -->




<!-- Begin
var nDots = 7;
var Xpos = 0;
var Ypos = 0;

var DELTAT = .01;
var SEGLEN = 10;
var SPRINGK = 10;
var MASS = 1;
var GRAVITY = 50;
var RESISTANCE = 10;
var STOPVEL = 0.1;
var STOPACC = 0.1;
var DOTSIZE = 11;
var BOUNCE = 0.75;
var isNetscape = navigator.appName=="Netscape";
var followmouse = true;
var dots = new Array();
init();
function init() {
var i = 0;
for (i = 0; i < nDots; i++) {
dots[i] = new dot(i);
}
if (!isNetscape) {
// I only know how to read the locations of the 
// <LI> items in IE
//skip this for now
// setInitPositions(dots)
}
for (i = 0; i < nDots; i++) {
dots[i].obj.left = dots[i].X;
dots[i].obj.top = dots[i].Y;
}
if (isNetscape) {
startanimate();
} else {
// let dots sit there for a few seconds
// since they're hiding on the real bullets
setTimeout("startanimate()", 3000);
   }
}
function dot(i) {
this.X = Xpos;
this.Y = Ypos;
this.dx = 0;
this.dy = 0;
if (isNetscape) {	
this.obj = eval("document.dot" + i);
} else {
this.obj = eval("dot" + i + ".style");
   }
}
function startanimate() {	
setInterval("animate()", 20);
}
function setInitPositions(dots) {
var startloc = document.all.tags("LI");
var i = 0;
for (i = 0; i < startloc.length && i < (nDots - 1); i++) {
dots[i+1].X = startloc[i].offsetLeft
startloc[i].offsetParent.offsetLeft - DOTSIZE;
dots[i+1].Y = startloc[i].offsetTop +
startloc[i].offsetParent.offsetTop + 2*DOTSIZE;
}
dots[0].X = dots[1].X;
dots[0].Y = dots[1].Y - SEGLEN;
}
function MoveHandler(e) {
Xpos = e.pageX;
Ypos = e.pageY;	  
return true;
}
function MoveHandlerIE() {
Xpos = window.event.x + document.body.scrollLeft;
Ypos = window.event.y + document.body.scrollTop;	  
}
if (isNetscape) {
document.captureEvents(Event.MOUSEMOVE);
document.onMouseMove = MoveHandler;
} else {
document.onmousemove = MoveHandlerIE;
}
function vec(X, Y)
{
this.X = X;
this.Y = Y;
}

// adds force in X and Y to spring for dot[i] on dot[j]
function springForce(i, j, spring)
{
var dx = (dots[i].X - dots[j].X);
var dy = (dots[i].Y - dots[j].Y);
var len = Math.sqrt(dx*dx + dy*dy);
if (len > SEGLEN) {
var springF = SPRINGK * (len - SEGLEN);
spring.X += (dx / len) * springF;
spring.Y += (dy / len) * springF;
   }
}
function animate() {	
var start = 0;
if (followmouse) {
dots[0].X = Xpos;
dots[0].Y = Ypos;	
start = 1;
}
for (i = start ; i < nDots; i++ ) {
var spring = new vec(0, 0);
if (i > 0) {
springForce(i-1, i, spring);
}
if (i < (nDots - 1)) {
springForce(i+1, i, spring);
}
var resist = new vec(-dots[i].dx * RESISTANCE, -dots[i].dy * RESISTANCE);
var accel = new vec((spring.X + resist.X)/ MASS, (spring.Y + resist.Y)/ MASS + GRAVITY);
dots[i].dx += (DELTAT * accel.X);
dots[i].dy += (DELTAT * accel.Y);
if (Math.abs(dots[i].dx) < STOPVEL &&
Math.abs(dots[i].dy) < STOPVEL &&
Math.abs(accel.X) < STOPACC &&
Math.abs(accel.Y) < STOPACC) {
dots[i].dx = 0;
dots[i].dy = 0;
}
dots[i].X += dots[i].dx;
dots[i].Y += dots[i].dy;
var height, width;
if (isNetscape) {
height = window.innerHeight + document.scrollTop;
width = window.innerWidth + document.scrollLeft;
} else {	
height = document.body.clientHeight + document.body.scrollTop;
width = document.body.clientWidth + document.body.scrollLeft;
}
if (dots[i].Y >=  height - DOTSIZE - 1) {
if (dots[i].dy > 0) {
dots[i].dy = BOUNCE * -dots[i].dy;
}
dots[i].Y = height - DOTSIZE - 1;
}
if (dots[i].X >= width - DOTSIZE) {
if (dots[i].dx > 0) {
dots[i].dx = BOUNCE * -dots[i].dx;
}
dots[i].X = width - DOTSIZE - 1;
}
if (dots[i].X < 0) {
if (dots[i].dx < 0) {
dots[i].dx = BOUNCE * -dots[i].dx;
}
dots[i].X = 0;
}
dots[i].obj.left = dots[i].X;			
dots[i].obj.top =  dots[i].Y;		
   }
}
// End -->
</script>

<P>
<P>
<a name="source">
<table BORDER=0 WIDTH=486 CELLPADDING=3 CELLSPACING=0>
<tr><td BGCOLOR=yellow><font FACE="helvetica,arial,geneva"><b>JavaScript Source Code 3000:  Messages:  Elastic Bullets</b>
<p>Simply click inside the window below, use your cursor to highlight the script, and copy (type Control-c or Apple-c) the script into a new file in your text editor (such as Note Pad or Simple Text) and save (Control-s or Apple-s).  The script is yours!!!
<br><br></font></td></tr>
<tr><td BGCOLOR=yellow ALIGN=CENTER>
<form NAME="copy">

<DIV align="center">
<input type=button value="Highlight All" onClick="javascript:this.form.txt.focus();this.form.txt.select();">&nbsp;&nbsp;&nbsp;&nbsp;
<INPUT TYPE="text" NAME="total" VALUE="Script Size:  6.05 KB" size=24>
</DIV>

<textarea NAME="txt" ROWS=20 COLS=75 WRAP=VIRTUAL>

&lt;!-- ONE STEP TO INSTALL ELASTIC BULLETS:

  1.  Copy the coding into the BODY of your HTML document  --&gt;

&lt;!-- STEP ONE: Paste this code into the BODY of your HTML document  --&gt;

&lt;BODY&gt;

&lt;div id="dot0" style="position: absolute; visibility: hidden; height: 11; width: 11;"&gt;&lt;img src="bullet.gif" height=11 width=11&gt;&lt;/div&gt;
&lt;div id="dot1" style="position: absolute; height: 11; width: 11;"&gt;&lt;img src="bullet.gif" height=11 width=11&gt;&lt;/div&gt;
&lt;div id="dot2" style="position: absolute; height: 11; width: 11;"&gt;&lt;img src="bullet.gif" height=11 width=11&gt;&lt;/div&gt;
&lt;div id="dot3" style="position: absolute; height: 11; width: 11;"&gt;&lt;img src="bullet.gif" height=11 width=11&gt;&lt;/div&gt;
&lt;div id="dot4" style="position: absolute; height: 11; width: 11;"&gt;&lt;img src="bullet.gif" height=11 width=11&gt;&lt;/div&gt;
&lt;div id="dot5" style="position: absolute; height: 11; width: 11;"&gt;&lt;img src="bullet.gif" height=11 width=11&gt;&lt;/div&gt;
&lt;div id="dot6" style="position: absolute; height: 11; width: 11;"&gt;&lt;img src="bullet.gif" height=11 width=11&gt;&lt;/div&gt;

&lt;SCRIPT LANGUAGE="JavaScript"&gt;
&lt;!-- Original:  Philip Winston (pwinston@yahoo.com) --&gt;
&lt;!-- Web Site:  http://members.xoom.com/ebullets --&gt;
&lt;!-- 'Scrolling Fix' by Troels Jakobsen &lt;tjak@get2net.dk&gt; --&gt;

&lt;! &gt;
&lt;! &gt;

&lt;!-- Begin
var nDots = 7;
var Xpos = 0;
var Ypos = 0;

var DELTAT = .01;
var SEGLEN = 10;
var SPRINGK = 10;
var MASS = 1;
var GRAVITY = 50;
var RESISTANCE = 10;
var STOPVEL = 0.1;
var STOPACC = 0.1;
var DOTSIZE = 11;
var BOUNCE = 0.75;
var isNetscape = navigator.appName=="Netscape";
var followmouse = true;
var dots = new Array();
init();
function init() {
var i = 0;
for (i = 0; i &lt; nDots; i++) {
dots[i] = new dot(i);
}
if (!isNetscape) {
// I only know how to read the locations of the 
// &lt;LI&gt; items in IE
//skip this for now
// setInitPositions(dots)
}
for (i = 0; i &lt; nDots; i++) {
dots[i].obj.left = dots[i].X;
dots[i].obj.top = dots[i].Y;
}
if (isNetscape) {
startanimate();
} else {
// let dots sit there for a few seconds
// since they're hiding on the real bullets
setTimeout("startanimate()", 3000);
   }
}
function dot(i) {
this.X = Xpos;
this.Y = Ypos;
this.dx = 0;
this.dy = 0;
if (isNetscape) {	
this.obj = eval("document.dot" + i);
} else {
this.obj = eval("dot" + i + ".style");
   }
}
function startanimate() {	
setInterval("animate()", 20);
}
function setInitPositions(dots) {
var startloc = document.all.tags("LI");
var i = 0;
for (i = 0; i &lt; startloc.length && i &lt; (nDots - 1); i++) {
dots[i+1].X = startloc[i].offsetLeft
startloc[i].offsetParent.offsetLeft - DOTSIZE;
dots[i+1].Y = startloc[i].offsetTop +
startloc[i].offsetParent.offsetTop + 2*DOTSIZE;
}
dots[0].X = dots[1].X;
dots[0].Y = dots[1].Y - SEGLEN;
}
function MoveHandler(e) {
Xpos = e.pageX;
Ypos = e.pageY;	  
return true;
}
function MoveHandlerIE() {
Xpos = window.event.x + document.body.scrollLeft;
Ypos = window.event.y + document.body.scrollTop;	  
}
if (isNetscape) {
document.captureEvents(Event.MOUSEMOVE);
document.onMouseMove = MoveHandler;
} else {
document.onmousemove = MoveHandlerIE;
}
function vec(X, Y)
{
this.X = X;
this.Y = Y;
}

// adds force in X and Y to spring for dot[i] on dot[j]
function springForce(i, j, spring)
{
var dx = (dots[i].X - dots[j].X);
var dy = (dots[i].Y - dots[j].Y);
var len = Math.sqrt(dx*dx + dy*dy);
if (len &gt; SEGLEN) {
var springF = SPRINGK * (len - SEGLEN);
spring.X += (dx / len) * springF;
spring.Y += (dy / len) * springF;
   }
}
function animate() {	
var start = 0;
if (followmouse) {
dots[0].X = Xpos;
dots[0].Y = Ypos;	
start = 1;
}
for (i = start ; i &lt; nDots; i++ ) {
var spring = new vec(0, 0);
if (i &gt; 0) {
springForce(i-1, i, spring);
}
if (i &lt; (nDots - 1)) {
springForce(i+1, i, spring);
}
var resist = new vec(-dots[i].dx * RESISTANCE, -dots[i].dy * RESISTANCE);
var accel = new vec((spring.X + resist.X)/ MASS, (spring.Y + resist.Y)/ MASS + GRAVITY);
dots[i].dx += (DELTAT * accel.X);
dots[i].dy += (DELTAT * accel.Y);
if (Math.abs(dots[i].dx) &lt; STOPVEL &&
Math.abs(dots[i].dy) &lt; STOPVEL &&
Math.abs(accel.X) &lt; STOPACC &&
Math.abs(accel.Y) &lt; STOPACC) {
dots[i].dx = 0;
dots[i].dy = 0;
}
dots[i].X += dots[i].dx;
dots[i].Y += dots[i].dy;
var height, width;
if (isNetscape) {
height = window.innerHeight + document.scrollTop;
width = window.innerWidth + document.scrollLeft;
} else {	
height = document.body.clientHeight + document.body.scrollTop;
width = document.body.clientWidth + document.body.scrollLeft;
}
if (dots[i].Y &gt;=  height - DOTSIZE - 1) {
if (dots[i].dy &gt; 0) {
dots[i].dy = BOUNCE * -dots[i].dy;
}
dots[i].Y = height - DOTSIZE - 1;
}
if (dots[i].X &gt;= width - DOTSIZE) {
if (dots[i].dx &gt; 0) {
dots[i].dx = BOUNCE * -dots[i].dx;
}
dots[i].X = width - DOTSIZE - 1;
}
if (dots[i].X &lt; 0) {
if (dots[i].dx &lt; 0) {
dots[i].dx = BOUNCE * -dots[i].dx;
}
dots[i].X = 0;
}
dots[i].obj.left = dots[i].X;			
dots[i].obj.top =  dots[i].Y;		
   }
}
// End --&gt;
&lt;/script&gt;

 

&lt;!-- Script Size:  6.05 KB --&gt;</textarea><br><font FACE="helvetica,arial,geneva"></font></td></tr>

</table>
</form>
</FONT>
</CENTER>


</center>
</body></html>